Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Happening once in four years.
  • adj. Lasting for four years.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Happening every four years.
  • adj. Lasting for four years.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Comprising four years.
  • adj. Occurring once in four years, or at the end of every four years.

from The Century Dictionary and Cyclopedia

  • Comprising four years: as, a quadrennial period.
  • Occurring once in four years: as, quadrennial elections.
  • n. A fourth anniversary, or its celebration.

Etymologies

From Latin quadriennial ("four-year period"), from quattuor ("four") + annus ("year"). (Wiktionary)

Examples

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  • zzzzzzzzzzzzzzzzz.

    September 28, 2008

  • "The positioning was in keeping with what is now a quadrennial rite in which the campaigns go full bore to convince the news media, and ultimately the public, that their candidate won — or more than that, to argue that the debate spotlighted some sort of character or issue defect in their opponent."

    The New York Times, The Next Day, a New Debate on Who Won, by Jim Rutenberg, September 27, 2008

    September 28, 2008